汽车动力性分析

《汽车动力性分析》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、某中型货车的有关参数如下:总质量车轮滚动半径传动系机械效率滚动阻力空气阻力因数主减速器传动比m=9300Kgr=0.49m直接挡^=0.9其余各档7!=0.85仁0.015CdA=3m2io二6.33变速器传动比及相应档位的旋转质量换算系数:档位I挡II挡III挡IV挡V挡传动比7.314.312.451.541旋转质量换算系数3.171.771.271.121.07转速n(r/min)10001500200025003000350038004000转矩T(N.m)135.33147.10152.98156.91147.1013&27133.371

2、25.53要求(允许利用计算机计算):(1)计算并绘制驱动力与行驶阻力平衡图，求出最高车速和最大爬坡度。(2)计算并绘制行驶加速度曲线。(3)计算并绘制动力特性图，确定最高车速和最大爬坡度。(4)计算并绘制功率平衡图，确定最高车速和最大爬坡度。解：计算该汽车在各档位的不同转速下的速度v,Ff,Fw,Ft,dv/dt,驱动功率Pt,空气阻力损失的功率Pw,Pf以及行驶阻力及其功率(Ff+Fw),(Pf+Pw),及动力因数D的数值并绘制成如下的表格:Ttqn0igVFtFfFwDdv/dtPf+PwPt135.3310003.177.313.99210

3、86313952.2610.11680.32111.54912.05147.115003.177.315.9881180713955.0870.12690.3532.32919.64152.9820003.177.317.9841227913959.0430.13190.36893.11427.23156.9125003.177.319.98112595139514.130.13530.37943.90734.92147.130003.177.3111.9811807139520.350.12670.35254.70939.2813&2735003

4、.177.3113.9711099139527.690.1190.32825.52243.08133.3738003.177.3115.1710705139532.640.11480.31476.01645.11125.5340003.177.3115.9710076139536.170.1080.29326.34844.7135.3310001.774.316.771640513956.5030.06880.30392.63612.05147.115001.774.3110.166962139514.630.07470.33733.97719.6

5、4152.9820001.774.3113.547240139526.010.07760.35355.34527.23156.9125001.774.3116.937426139540.640.07940.36396.75134.92147.130001.774.3120.31696213955&530.07420.33468.20239.28138.2735001.774.3123.76544139579.660.06950.30799.70843.08133.3738001.774.3125.736312139593.910.06690.293

6、10.6445.11125.5340001.774.3127.0859411395104.10.06280.269811.2844.7135.3310001.272.4511.913641139520.130.03890.18844.68212.05147.115001.272.4517.873957139545.280.04210.21317.14819.64152.9820001.272.4523.824116139580.50.04340.22359.76427.23156.9125001.272.4529.7842211395125.80.

7、0440.228612.5834.92147.130001.272.4535.7339571395181.10.04060.201615.6539.28138.2735001.272.4541.6937201395246.50.03730.17619.0143.08133.3738001.272.4545.2635881395290.60.03550.161121.1945.11125.5340001.272.4547.65337713953220.03290.140622.7244.7135.3310001.121.5418.9522881395

8、50.940.02410.08097.61112.05147.115001.121.5428.4324871395114.